The workflow JSON

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{
  "name": "visits-prune",
  "nodes": [
    {
      "parameters": {
        "content": "## Visits Prune\n\nDeletes `Visits` rows older than **90 days**, daily at 03:00.\n\nThis is not housekeeping \u2014 the website's privacy policy *states* a 90-day retention window, and raw IP addresses are personal data. Without this workflow that published claim is false.\n\n**Flow:** Schedule \u2192 Read Timestamps \u2192 Anything To Prune? \u2192 Delete Old Rows\n\nNo Code node: the row maths lives in the delete node's body expression, so a task-runner outage cannot silently stop retention from being enforced.\n\nRows are deleted bottom-up so earlier indices stay valid. A row whose timestamp will not parse is left alone (NaN comparisons are false) rather than guessed at.",
        "height": 460,
        "width": 380
      },
      "id": "a5b6c7d8-0001-4001-8001-000000000001",
      "name": "Overview",
      "type": "n8n-nodes-base.stickyNote",
      "typeVersion": 1,
      "position": [
        0,
        0
      ]
    },
    {
      "parameters": {
        "rule": {
          "interval": [
            {
              "triggerAtHour": 3
            }
          ]
        }
      },
      "id": "a5b6c7d8-0002-4002-8002-000000000002",
      "name": "Daily 03:00",
      "type": "n8n-nodes-base.scheduleTrigger",
      "typeVersion": 1.2,
      "position": [
        420,
        300
      ]
    },
    {
      "parameters": {
        "url": "https://sheets.googleapis.com/v4/spreadsheets/YOUR_SIGNUPS_SPREADSHEET_ID/values/Visits!A1:A10000",
        "authentication": "predefinedCredentialType",
        "nodeCredentialType": "googleSheetsOAuth2Api",
        "options": {}
      },
      "id": "a5b6c7d8-0003-4003-8003-000000000003",
      "name": "Read Timestamps",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "position": [
        640,
        300
      ],
      "credentials": {
        "googleSheetsOAuth2Api": {
          "name": "<your credential>"
        }
      }
    },
    {
      "parameters": {
        "conditions": {
          "options": {
            "caseSensitive": true,
            "leftValue": "",
            "typeValidation": "strict",
            "version": 2
          },
          "conditions": [
            {
              "id": "has-expired-rows",
              "leftValue": "={{ (($json.values || []).slice(1).filter(r => Date.parse(r[0]) < $now.minus({ days: 90 }).toMillis()).length) > 0 }}",
              "rightValue": "",
              "operator": {
                "type": "boolean",
                "operation": "true",
                "singleValue": true
              }
            }
          ],
          "combinator": "and"
        },
        "options": {}
      },
      "id": "a5b6c7d8-0004-4004-8004-000000000004",
      "name": "Anything To Prune?",
      "type": "n8n-nodes-base.if",
      "typeVersion": 2.2,
      "position": [
        860,
        300
      ]
    },
    {
      "parameters": {
        "method": "POST",
        "url": "https://sheets.googleapis.com/v4/spreadsheets/YOUR_SIGNUPS_SPREADSHEET_ID:batchUpdate",
        "authentication": "predefinedCredentialType",
        "nodeCredentialType": "googleSheetsOAuth2Api",
        "sendBody": true,
        "specifyBody": "json",
        "jsonBody": "={{ JSON.stringify({ requests: ($('Read Timestamps').item.json.values || []).map((r, i) => ({ i, t: Date.parse(r[0]) })).filter(x => x.i > 0 && x.t < $now.minus({ days: 90 }).toMillis()).map(x => x.i).sort((a, b) => b - a).map(i => ({ deleteDimension: { range: { sheetId: YOUR_VISITS_SHEET_GID, dimension: 'ROWS', startIndex: i, endIndex: i + 1 } } })) }) }}",
        "options": {}
      },
      "id": "a5b6c7d8-0005-4005-8005-000000000005",
      "name": "Delete Old Rows",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "position": [
        1080,
        220
      ],
      "credentials": {
        "googleSheetsOAuth2Api": {
          "name": "<your credential>"
        }
      }
    }
  ],
  "connections": {
    "Daily 03:00": {
      "main": [
        [
          {
            "node": "Read Timestamps",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Read Timestamps": {
      "main": [
        [
          {
            "node": "Anything To Prune?",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Anything To Prune?": {
      "main": [
        [
          {
            "node": "Delete Old Rows",
            "type": "main",
            "index": 0
          }
        ],
        []
      ]
    }
  },
  "settings": {
    "executionOrder": "v1",
    "errorWorkflow": "YOUR_ERROR_WORKFLOW_ID"
  }
}